[Solved] "One or more of your main mod files did not compile properly."

I keep getting the above error message. The console shows multiple errors of "error: package net.mcreator.modname.entity does not exist", followed by many more errors of "error: cannot find symbol".

I went to the knowledge base, which said the problem would be resolved if I followed the steps of the 'second most common solution'. I followed each step in order, reloading my computer in between each attempt, and after trying all 3, the problem still persists.

I am at a loss for what to do. If anyone knows a fix, please let me know.

Thanks in advance!